I've used 2 of the 3 sites below for years.  I discovered the Internet Health Report site today and bookmarked it as a monitoring resource.

Internet Storm Center - Significant Security Events
http://isc.sans.org/

Internet Health Report - Status of Major Carriers
http://internethealthreport.com/

Internet Traffic Report - Status of Performance by Continent
http://www.internettrafficreport.com/